Is it permissible for the mother to prepare a feast for the newborn, within reasonable limits, without extravagance or waste, and without musical instruments or singing?

There is no harm in women visiting the child's mother; it falls under the category of visiting the sick and mutual visitation, which are enjoined by Islamic law. There is also no harm in the mother offering some sweets and drinks to the visitors, as this falls under the category of honor and kindness, and it is not extravagance as long as it does not exceed what is customary. As for what is known as the "Subu' (seventh-day celebration)," its ruling has been previously clarified.